condition mean min max ZT0-3 226.14999999999998 226.14999999999998 226.14999999999998 ZT4-7 364.4 364.4 364.4 ZT8-11 310.1 310.1 310.1 ZT12-15 367.3 367.3 367.3 ZT16-19 289.6 289.6 289.6 ZT20-23 206.35000000000002 206.35000000000002 206.35000000000002